package com.zzyl.framework.interceptor;

import cn.hutool.core.map.MapUtil;
import cn.hutool.core.util.ObjectUtil;
import cn.hutool.core.util.StrUtil;
import com.zzyl.common.utils.UserThreadLocal;
import com.zzyl.framework.web.service.TokenService;
import io.jsonwebtoken.Claims;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component
public class MemberInterceptor implements HandlerInterceptor {
    @Autowired
    private TokenService tokenService;



    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        // 1.拿到当前请求的token
        String token = request.getHeader("authorization");

        // 2.判断token是否为空，如果为空，直接拦截，返回未登录
        if (StrUtil.isEmpty(token)){
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            throw new RuntimeException("请登录");
        }

        // 3.如果token不为空，就解析token  TODO
        Claims claims = tokenService.parseToken(token);
        if (ObjectUtil.isEmpty(claims)){
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            throw new RuntimeException("非法访问");
        }

        // 4.拿到用户信息
        Long userId = MapUtil.get(claims, "userId", Long.class);
        if (ObjectUtil.isEmpty(userId)){
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            throw new RuntimeException("非法访问");
        }

        // 5.将用户信息放入ThreadLocal
        UserThreadLocal.setUserId(userId);

        // 6.放行
        return true;
    }


    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        // 清空ThreadLocal
        UserThreadLocal.remove();
    }
}
